package com.lagou.handler;

import com.lagou.service.UserServiceImpl;
import com.lagou.util.RpcRequest;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.springframework.beans.BeansException;
import org.springframework.cglib.reflect.FastClass;
import org.springframework.cglib.reflect.FastMethod;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;

/**
 * 自定义的业务处理器
 */
@Component
public class UserServiceHandler extends ChannelInboundHandlerAdapter implements ApplicationContextAware {

    private static ApplicationContext act;

    //当客户端读取数据时,该方法会被调用
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        RpcRequest msg1 = (RpcRequest) msg;
        Object handler = handler(msg1);
        ctx.writeAndFlush("success");


        //注意:  客户端将来发送请求的时候会传递一个参数:  UserService#sayHello#are you ok
         //1.判断当前的请求是否符合规则
//        if(msg.toString().startsWith("UserService")){
//            //2.如果符合规则,调用实现类货到一个result
//            UserServiceImpl service = new UserServiceImpl();
//            String result = service.sayHello(msg.toString().substring(msg.toString().lastIndexOf("#")+1));
//            //3.把调用实现类的方法获得的结果写到客户端
//            ctx.writeAndFlush(result);
//        }
    }

    public Object handler(RpcRequest request) throws ClassNotFoundException, InvocationTargetException {
        Class<?> aClass = Class.forName(request.getClassName());
        Object serviceBean = act.getBean(aClass);
        Class<?> serviceBeanClass = serviceBean.getClass();
        String methodName = request.getMethodName();

        Class<?>[] parameterTypes = request.getParameterTypes();
        Object[] parameters = request.getParameters();

        FastClass fastClass = FastClass.create(serviceBeanClass);
        FastMethod fastMethod = fastClass.getMethod(methodName,parameterTypes);
        return fastMethod.invoke(serviceBean,parameters);
    }

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        UserServiceHandler.act = applicationContext;
    }
}
